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2fe58dfd SE |
1 | /* $Log: secnet.c,v $ |
2 | * Revision 1.1 1996/03/13 22:27:41 sde1000 | |
3 | * Initial revision | |
4 | * | |
5 | */ | |
6 | ||
974d0468 | 7 | extern char version[]; |
2fe58dfd | 8 | |
8689b3a9 | 9 | #include "secnet.h" |
2fe58dfd SE |
10 | #include <stdio.h> |
11 | #include <string.h> | |
12 | #include <getopt.h> | |
2fe58dfd | 13 | #include <errno.h> |
8689b3a9 | 14 | #include <unistd.h> |
2fe58dfd | 15 | #include <sys/socket.h> |
2fe58dfd | 16 | #include <arpa/inet.h> |
2fe58dfd | 17 | #include <pwd.h> |
2fe58dfd | 18 | |
2fe58dfd SE |
19 | #include "util.h" |
20 | #include "conffile.h" | |
2fe58dfd SE |
21 | |
22 | /* Command-line options (possibly config-file options too) */ | |
23 | static char *configfile="/etc/secnet/secnet.conf"; | |
24 | static char *userid=NULL; | |
25 | static uid_t uid=0; | |
26 | static bool_t background=True; | |
27 | static char *pidfile=NULL; | |
28 | ||
29 | /* Structures dealing with poll() call */ | |
30 | struct poll_interest { | |
31 | beforepoll_fn *before; | |
32 | afterpoll_fn *after; | |
33 | void *state; | |
34 | uint32_t max_nfds; | |
35 | uint32_t nfds; | |
36 | string_t desc; | |
37 | struct poll_interest *next; | |
38 | }; | |
39 | static struct poll_interest *reg=NULL; | |
40 | static uint32_t total_nfds=10; | |
41 | ||
42 | static bool_t finished=False; | |
43 | ||
44 | /* Parse the command line options */ | |
45 | static void parse_options(int argc, char **argv) | |
46 | { | |
47 | int c; | |
48 | ||
49 | while (True) { | |
50 | int option_index = 0; | |
51 | static struct option long_options[] = { | |
52 | {"verbose", 0, 0, 'v'}, | |
53 | {"nowarnings", 0, 0, 'w'}, | |
54 | {"help", 0, 0, 2}, | |
55 | {"version", 0, 0, 1}, | |
56 | {"nodetach", 0, 0, 'n'}, | |
57 | {"silent", 0, 0, 'f'}, | |
58 | {"quiet", 0, 0, 'f'}, | |
59 | {"debug", 1, 0, 'd'}, | |
60 | {"config", 1, 0, 'c'}, | |
61 | {0,0,0,0} | |
62 | }; | |
63 | ||
64 | c=getopt_long(argc, argv, "vwdnc:ft:", | |
65 | long_options, &option_index); | |
66 | if (c==-1) | |
67 | break; | |
68 | ||
69 | switch(c) { | |
70 | case 2: | |
71 | /* Help */ | |
72 | fprintf(stderr, | |
73 | "Usage: secnet [OPTION]...\n\n" | |
74 | " -f, --silent, --quiet suppress error messages\n" | |
75 | " -w, --nowarnings suppress warnings\n" | |
76 | " -v, --verbose output extra diagnostics\n" | |
77 | " -c, --config=filename specify a configuration file\n" | |
78 | " -n, --nodetach do not run in background\n" | |
79 | " -d, --debug=item,... set debug options\n" | |
80 | " --help display this help and exit\n" | |
81 | " --version output version information and exit\n" | |
82 | ); | |
83 | exit(0); | |
84 | break; | |
85 | ||
86 | case 1: | |
87 | /* Version */ | |
88 | fprintf(stderr,"%s\n",version); | |
89 | exit(0); | |
90 | break; | |
91 | ||
92 | case 'v': | |
93 | message_level|=M_INFO|M_WARNING|M_ERROR|M_FATAL; | |
94 | break; | |
95 | ||
96 | case 'n': | |
97 | background=False; | |
98 | break; | |
99 | ||
100 | case 'd': | |
101 | message_level|=M_DEBUG_CONFIG|M_DEBUG_PHASE; | |
102 | break; | |
103 | ||
104 | case 'f': | |
105 | message_level=M_FATAL; | |
106 | break; | |
107 | ||
108 | case 'c': | |
109 | if (optarg) | |
110 | configfile=safe_strdup(optarg,"config_filename"); | |
111 | else | |
112 | fatal("secnet: no config filename specified"); | |
113 | break; | |
114 | ||
115 | case '?': | |
116 | break; | |
117 | ||
118 | default: | |
119 | Message(M_WARNING,"secnet: Unknown getopt code %c\n",c); | |
120 | } | |
121 | } | |
122 | ||
123 | if (argc-optind != 0) { | |
124 | Message(M_WARNING,"secnet: You gave extra command line parameters, " | |
125 | "which were ignored.\n"); | |
126 | } | |
127 | } | |
128 | ||
129 | static void setup(dict_t *config) | |
130 | { | |
131 | list_t *l; | |
132 | item_t *site; | |
133 | dict_t *system; | |
134 | struct log_if *log; | |
135 | struct passwd *pw; | |
136 | struct cloc loc; | |
137 | int i; | |
138 | ||
139 | l=dict_lookup(config,"system"); | |
140 | ||
141 | if (!l || list_elem(l,0)->type!=t_dict) { | |
142 | fatal("configuration does not include a \"system\" dictionary\n"); | |
143 | } | |
144 | system=list_elem(l,0)->data.dict; | |
145 | loc=list_elem(l,0)->loc; | |
146 | ||
147 | /* Arrange systemwide log facility */ | |
148 | l=dict_lookup(system,"log"); | |
149 | if (!l) { | |
150 | fatal("configuration does not include a system/log facility\n"); | |
151 | } | |
152 | log=init_log(l); | |
974d0468 | 153 | log->log(log->st,LOG_DEBUG,"%s: logging started",version); |
2fe58dfd SE |
154 | |
155 | /* Who are we supposed to run as? */ | |
156 | userid=dict_read_string(system,"userid",False,"system",loc); | |
157 | if (userid) { | |
158 | do { | |
159 | pw=getpwent(); | |
160 | if (pw && strcmp(pw->pw_name,userid)==0) { | |
161 | uid=pw->pw_uid; | |
162 | break; | |
163 | } | |
164 | } while(pw); | |
165 | endpwent(); | |
166 | if (uid==0) { | |
167 | fatal("userid \"%s\" not found\n",userid); | |
168 | } | |
169 | } | |
170 | ||
171 | /* Pidfile name */ | |
172 | pidfile=dict_read_string(system,"pidfile",False,"system",loc); | |
173 | ||
174 | /* Go along site list, starting sites */ | |
175 | l=dict_lookup(config,"sites"); | |
176 | if (!l) { | |
177 | fatal("configuration did not define any remote sites\n"); | |
178 | } | |
179 | i=0; | |
180 | while ((site=list_elem(l, i++))) { | |
181 | struct site_if *s; | |
182 | if (site->type!=t_closure) { | |
183 | cfgfatal(site->loc,"system","non-closure in site list"); | |
184 | } | |
185 | if (site->data.closure->type!=CL_SITE) { | |
186 | cfgfatal(site->loc,"system","non-site closure in site list"); | |
187 | } | |
188 | s=site->data.closure->interface; | |
189 | s->control(s->st,True); | |
190 | } | |
191 | } | |
192 | ||
193 | void register_for_poll(void *st, beforepoll_fn *before, | |
194 | afterpoll_fn *after, uint32_t max_nfds, string_t desc) | |
195 | { | |
196 | struct poll_interest *i; | |
197 | ||
198 | i=safe_malloc(sizeof(*i),"register_for_poll"); | |
199 | i->before=before; | |
200 | i->after=after; | |
201 | i->state=st; | |
202 | i->max_nfds=max_nfds; | |
203 | i->nfds=0; | |
204 | i->desc=desc; | |
205 | total_nfds+=max_nfds; | |
206 | i->next=reg; | |
207 | reg=i; | |
208 | return; | |
209 | } | |
210 | ||
211 | static void system_phase_hook(void *sst, uint32_t newphase) | |
212 | { | |
213 | if (newphase==PHASE_SHUTDOWN && pidfile) { | |
214 | /* Try to unlink the pidfile; don't care if it fails */ | |
215 | unlink(pidfile); | |
216 | } | |
217 | } | |
218 | ||
219 | static void run(void) | |
220 | { | |
221 | struct timeval tv_now; | |
222 | uint64_t now; | |
223 | struct poll_interest *i; | |
224 | int rv, nfds, remain, idx; | |
225 | int timeout; | |
226 | struct pollfd *fds; | |
227 | ||
228 | fds=alloca(sizeof(*fds)*total_nfds); | |
229 | if (!fds) { | |
230 | fatal("run: couldn't alloca\n"); | |
231 | } | |
232 | ||
233 | while (!finished) { | |
234 | if (gettimeofday(&tv_now, NULL)!=0) { | |
235 | fatal_perror("main loop: gettimeofday"); | |
236 | } | |
237 | now=(tv_now.tv_sec*1000)+(tv_now.tv_usec/1000); | |
238 | idx=0; | |
239 | for (i=reg; i; i=i->next) { | |
240 | i->after(i->state, fds+idx, i->nfds, &tv_now, &now); | |
241 | idx+=i->nfds; | |
242 | } | |
243 | remain=total_nfds; | |
244 | idx=0; | |
245 | timeout=-1; | |
246 | for (i=reg; i; i=i->next) { | |
247 | nfds=remain; | |
248 | rv=i->before(i->state, fds+idx, &nfds, &timeout, &tv_now, &now); | |
249 | if (rv!=0) { | |
250 | /* XXX we need to handle this properly: increase the | |
251 | nfds available */ | |
252 | fatal("run: beforepoll_fn (%s) returns %d\n",i->desc,rv); | |
253 | } | |
254 | if (timeout<-1) { | |
255 | fatal("run: beforepoll_fn (%s) set timeout to %d\n",timeout); | |
256 | } | |
257 | idx+=nfds; | |
258 | remain-=nfds; | |
259 | i->nfds=nfds; | |
260 | } | |
261 | do { | |
262 | rv=poll(fds, idx, timeout); | |
263 | if (rv<0) { | |
264 | if (errno!=EINTR) { | |
265 | fatal_perror("run: poll"); | |
266 | } | |
267 | } | |
268 | } while (rv<0); | |
269 | } | |
270 | } | |
271 | ||
272 | static void droppriv(void) | |
273 | { | |
274 | FILE *pf=NULL; | |
275 | pid_t p; | |
276 | ||
277 | add_hook(PHASE_SHUTDOWN,system_phase_hook,NULL); | |
278 | ||
279 | /* Background now, if we're supposed to: we may be unable to write the | |
280 | pidfile if we don't. */ | |
281 | if (background) { | |
282 | printf("goto background\n"); | |
283 | /* Open the pidfile before forking - that way the parent can tell | |
284 | whether it succeeds */ | |
285 | if (pidfile) { | |
286 | pf=fopen(pidfile,"w"); | |
287 | if (!pf) { | |
288 | fatal_perror("cannot open pidfile \"%s\"",pidfile); | |
289 | } | |
290 | } else { | |
291 | Message(M_WARNING,"secnet: no pidfile configured, but " | |
292 | "backgrounding anyway\n"); | |
293 | } | |
294 | p=fork(); | |
295 | if (p>0) { | |
296 | if (pf) { | |
297 | /* Parent process - write pidfile, exit */ | |
298 | fprintf(pf,"%d\n",p); | |
299 | fclose(pf); | |
300 | } | |
301 | exit(0); | |
302 | } else if (p==0) { | |
303 | /* Child process - all done, just carry on */ | |
304 | if (pf) fclose(pf); | |
305 | printf("child\n"); | |
306 | } else { | |
307 | /* Error */ | |
308 | fatal_perror("cannot fork"); | |
309 | exit(1); | |
310 | } | |
311 | } else { | |
312 | if (pidfile) { | |
313 | pf=fopen(pidfile,"w"); | |
314 | if (!pf) { | |
315 | fatal_perror("cannot open pidfile \"%s\"",pidfile); | |
316 | } | |
317 | fprintf(pf,"%d\n",getpid()); | |
318 | fclose(pf); | |
319 | } | |
320 | } | |
321 | ||
322 | /* Drop privilege now, if configured to do so */ | |
323 | if (uid!=0) { | |
324 | if (setuid(uid)!=0) { | |
325 | fatal_perror("can't set uid to \"%s\"",userid); | |
326 | } | |
327 | } | |
328 | } | |
329 | ||
330 | int main(int argc, char **argv) | |
331 | { | |
332 | dict_t *config; | |
333 | ||
334 | enter_phase(PHASE_GETOPTS); | |
335 | parse_options(argc,argv); | |
336 | ||
337 | enter_phase(PHASE_READCONFIG); | |
338 | config=read_conffile(configfile); | |
339 | ||
340 | enter_phase(PHASE_SETUP); | |
341 | setup(config); | |
342 | ||
343 | enter_phase(PHASE_DROPPRIV); | |
344 | droppriv(); | |
345 | ||
346 | enter_phase(PHASE_RUN); | |
347 | run(); | |
348 | ||
349 | enter_phase(PHASE_SHUTDOWN); | |
350 | ||
351 | return 0; | |
352 | } | |
353 |